"Adult content will no longer be allowed here," Tumblr said in a statement.

According to The Verge, the decision to nix adult content will "eradicate porn-related communities on the platform and fundamentally alter how the service is used," adding that the company said the ban "includes explicit sexual content and nudity with a few exceptions."

In a post about the ban, Tumblr defines adult content that "includes photos, videos, or GIFs that show real-life human genitals or female-presenting nipples, and any content—including photos, videos, GIFs and illustrations—that depicts sex acts."

There are a few exceptions, however. Nude classical statues and political protests that feature nudity will be safe on Tumblr. The new policy also excludes text, so erotica will remain published as will illustrations and art that features nudity — as long as sex acts are not depicted. Also allowed are breastfeeding videos and after-birth photos.

Tumblr is said to be emailing users who have posted adult content flagged by algorithms. They're being told their content will be hidden from view and posts with porn will be set private, preventing users from re-blogging them or sharing them elsewhere on Tumblr.

The Verge reports the announcement comes just days after Apple removed the Tumblr app from its App Store due to a child porn incident.

Apple's iPhones and iPads have gotten free software updates, including battery improvements and a smarter virtual assistant. The new features and capabilities in the update, iOS 9, are primarily refinements rather than anything transformative.